2.4.5 Electrical schematic diagram 

2.4.5.1 System Schematic Diagram 

NL02-2183b

 

 

Air intake 

Sensor 

Engine 

Air intake 

volume signal 

voltage 

Oil injecting

Air exhaust

Feedback 

signal 

voltage 

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Exhaust System Control Diagram

2.4.6 Diagnostic message and steps 

2.4.6 Diagnostic information and procedures 

2.4.6.1 Diagnosis descriptions 

Refer to 2.4.2 Description and Operation, get familiar with the system functions and operation 
before starting system diagnosis, so that it will help to determine the correct diagnostic steps, more 
importantly, it will also help to determine whether the situation described by the customer is 
normal. 

Precautions on Maintenance of Canister Solenoid Valve: 

1.  Make sure airflow direction comply with specifications. 

2.  When particles inside the valve body causing the control valve failure, replace canister 

solenoid valve and inspect the canister status. 

3.  During maintenance procedure, avoid water, oil and liquid entering into the valve. 

2.4.6.2 Visual inspection 

Inspect the after-sales optional device which may affect the normal operation of assistant emission 
control device. 

– 

Inspect the system components easy to access to identify whether there is significant damage 
or the existence of an external leakage. 

– 

Inspect whether the fuel is the recommended type and fill up the fuel tank. 

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2.4.6.3 Canister Solenoid Valve Inoperation 

Circuit diagram: 

NL02-2184b

44

EN01

ECM

BAT

15A

E

F

21

MPR

86

87

30

85

发动机主继电器

64

EN01

A

EN24

B

EN24

CCP

碳罐电磁阀

 

Diagnostic Steps: 

1 

Install fuel pressure gage in the fuel distributing pipe inlet. 

(a) Start 

the 

engine. 

Inspect whether the engine emission malfunction warning lamp is lit. 

 

2 

Repair the engine control system fault. 

(a)  Repair engine control system. For engine emission fault and warning lamp fault, refer to 

2.2.7.14 Fault diagnostic code chapter index. 

Is canister solenoid valve working properly? 

 

3 

Inspect canister solenoid valve power supply circuit. 

(a)  Turn on ignition switch. 

(b)  Measure canister solenoid valve EM24 terminal A voltage with a multimeter. 

Standard Voltage: 11-14 V 

Yes 

The system is normal. 

No 

No 

Go to step 3 

Yes 

Engine main relay

Canister electromagnetic valve 

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4 

Inspect the circuit between the canister solenoid valve harness connector EM24 
terminal A and the fuse EF21. 

(a)  Turn off the ignition switch. 

(b)  Measure the resistance between the fuse EF21 and the canister solenoid valve harness 

connector EM24 terminal A. 

Standard Resistance: Less than 1 Ω 

Does the resistance conform to standard value? 

 

5 

Repair the circuit between the canister solenoid valve wiring harness connector and 
the fuse EF21. 

(a)  Turn off the ignition switch. 

(b)  Repair the open circuit fault between the canister solenoid valve harness connector EM24 

terminal A and fuse EF21. 

Is canister solenoid valve working properly? 

 

6 

Inspect canister solenoid valve harness connector and ECM harness connector circuit. 

(a)  Turn off the ignition switch. 

(b)  Inspect resistance between canister solenoid valve harness connector EM24 terminal B and 

ECM harness connector EM01 terminal No.64 with the multimeter and confirm the circuit 
continuity. 

Standard Resistance: Less than 1 Ω 

Does the resistance conform to standard value? 

 

7 

Repair canister solenoid valve harness connector and ECM harness connector. 

(a)  Turn off the ignition switch. 

(b)  Repair canister solenoid valve harness connector EM24 terminal B and ECM harness 

connector EM01 terminal No.64 circuit open fault. 

Is canister solenoid valve working properly? 

Yes 

Go to step 8 

No 

Yes 

The system is normal. 

No 

Yes 

Go to step 6 

No 

Go to step 5 

Yes 

Go to step 6 

No 

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